How are the earth's crust and humans the most similar according to these graphs? a the largest percentage of both is oxygen. b silicon is rarely found in nature. c chemical reactions occur with similar frequency in humans and the earth's crust. d the smallest percentage of both is potassium.

Option (a) is the correct option that is largest percentage of oxygen is present in both earth's crust and human body.

Explanation: Oxygen is present in large amounts both in earth's crust and human body. The percentage of oxygen in earth's crust is 46.6% and the percentage of oxygen in the body is about 66.6%. So it is concluded that both human body and earth's crust have high percentage of oxygen.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.